I've got no evidence except anecdptes, but I've heard claims that GoDaddy used to do this a lot. For this reason I've only searched a domain I was going to immediately buy, otherwise I'll do a whois lookup to see if it's registered.
"Does GoDaddy register domains you search?" (2011) https://news.ycombinator.com/item?id=2326790
Within this, was the comment that reminded me which company it was I was talking about (https://news.ycombinator.com/item?id=2327152) - Network Solutions used to do this - and there is a Wiki link in there which gives the process a name! TIL! :)